uncharacteristic vs atypical

uncharacteristic and atypical both are adjectives.

Word	Noun	Adjective	Verb	Adverb
uncharacteristic	No	Yes	No	No
atypical	No	Yes	No	No

uncharacteristic (adjective)	atypical (adjective)
distinctive and not typical	not representative of a group, class, or type
	deviating from normal expectations; somewhat odd, strange, or abnormal